Method of forming mexible tubing



March 6, 1928.

- ATTORNEYS.

II-IIIIIIIII-IIIIIIIIII-IIIIIIIII II-IIIIIIIII-III"UNI-HUN!!! v H.KELLER METHOD OF FORMING FLEXIBLE TUBING Filed April 9, 1927III=IIIIIIIIII IIIIIII-IIIIIII IIIIIIII-IIIIIII Patented Mar. 6 192UNITED STATES HEBMANNVKELLER, on HILTON, NEW JERSEY. Assmnon 'ronons'rivnn CHAIN CORPO- RATION, or mvrne'ron, new JE SEY/A. oonronerronon new JERSEY.

mnrnon orronmne rnnxrnrnrnnme.

Applicationfiled April 9, 1927. Serial in. 182,325.

This invention relates to a method of forming a flexible tube from aplurality of helic'ally Wound strips of material and hasfor its objectto provide amethod by which 6 tl eco'ils are spaced apart by anintermediatefilling strip and this strip removed after the coils areformed. p I I v A' further object of the invention is the use of afilling strip to support the coils against pressure for operations onthe surc face of the outer coils to enhance the appearc Figure 2 is afragmentalsection showing the finished tube.

Figure 31s a -fragmental sectionshowing the intermediate. filling stripas interposed pbetween'thefouter and inner coils before the same hasbeenremoved.

' -Figure 4 is a side elevationrshowing the plurality of strips placedsideby side upon an arborito form a tube of difle're'nt appean ance. A rv f Figure 5' is a sectional view illustrating the tube as being [drawnthrough die to cause the outer surface to have, a uniform ap- Peamnce-Figure 6 is afsectional endview of the tub- ]ingflatte'ned. I

Figure 7 is a sectional fragmental view of the coilsafter being pressedon theirouter surfaces for ornamentation. 1

Figure 8 is a View similar to Figurel7 with the intermediate fillingstrip removed.

, Figure 9-is a.perspectiveviewof.thefilling strip. 1 Figure 10 is,aperspective, fragmental viewof the fillingstrip located in one of thechannel stripsfl'; I c 7 a It is found incpractice in. the makingofhelical tubing for ornamental purposes such as bracelets, chokers andthe like desirable to a make the same extremely flexible and, at thesame time ornament the outer surface of the router 0011s bypressmgrecesses therein and in order to'accomplish these results, Ihave.

la d a stamp ofv aI-ummum or some material these and other objectsinview, the

different from the inner and outer coils in the channels of the stripsof either the inner or outer coils to support the coils during theoperations thereon and then chemically remove thisfilling strip bydissolving it to leave a greater space between the coils for I.increasingtheir flexibility; and the follow ing' is a detaileddescription of the present .method by which these advantageous resultsmaybe accomplished: I p

Vlhth reference to thc drawings, 10 designates the outerstrip and 11 theinner strip of material, each channelshaped' in cross i section with theflanges 12 of two adjacent outer strips lying within the channel betweenthe flanges 13 of one of the inner coils and with a filling stripl'disposed in the channel ofthe inner strip to support the outer strip.The construction illustratedin Figures 2 and 3 consists of a singleinner strip and asingle outer strip wound into helical formation oneabout the other over an arbor such as 15 with thefianges in the innerstrip. extending outwardly andfthe flangeson the outer strip extendinginwardly and straddling the point between adja- J cent coils of theinner strip, by a process well known, however, I have added in thechannel of one of these coils a filling strip '14v illustrated in Figure3 in the inner coil,

which provides a supportcfor the outer coil so that its outer surfacewhich may be roughened or uneven, as illustrated'at 16 in Figure 5 maybesmoothed by drawing the same throughv a suitable die 17 and at thesame time this drawing operation may cause Ya change in the shape of thevtube from round to elliptical as illustrated at 18 in Figure 6, itbeing necessary that the outer coils should be supported by the fillingstrip in order that the change inshape', illustrated at 1.8, may beformed.

In someinstances, it is desirable to ornaw ment the outer strip 10 whichI maydo only when the-filling strip is used vby pressing re- V cesses 19in its outer surfaceasillustrated in Figure 7 which may offthemselves beof an ornamental configuration. to enhancethe appearance of the braceletor which may receive further ornamentation such asgems or the like Afterthe drawing operation and ornamental formations are completed thefilling strip 14- having served its usefulness is then removed frombetween the inner and outer coils by chemically disno I i solving it 7The filling strip is of amaterial different from the inner and outercoils, aluflanges of the outer strips and inner strips 11 to allowgreater freedom of the coils and flexibility of the tube when in use.

In some cases a plurality of strips for the inner and outer coils may bewound simultaneously about the arbor 1511s illustrated in Figure l. Apair of strips Ql and 22 each having a filling 14 of difierent material,are woundas a pair simultaneously to form the inner coils and a pair ofstrips 23 and 24 having different outer surfaces are woundsimultaneously side by side about the inner coil to form the outer coilof the tube each of the strips being channel shaped with their inwardlyextending flanges on the outer coil interlocked with r the outwardlyextending flanges on the inner coil to limit the closing movement of thecoils with relation toeach other. V c

It will be seen from the foregoing process that I have provided a methodby which :certain operations to increase the ornamental appearance ofthe tube may-be performed after which the filling strip necessary inorder that such operations may be performed is removed .to increase theflexibility of the bracelet which is also an improved and desirableresult in the finished product. Having thus described one illustrativeembodiment of my invention and the best mode known to me for carryingout my method, I desire it to be understood that although specific termsare employed, they are used in a generic and descriptive sense and notfor the purpose of limitation, the scope of the invention being definedand limited only by the terms of theappended claims.

Iclaim: V 1. A method of forming an ornamental tubing, which consists inwindinga plurality of channel-shaped strips of metal into helical coilsone upon theothcr with the inwardly-extending side flanges of each outercoil extending intothe channels between outwardly extending side flangesof adjacent inner coils and at the same time winding into helical form afilling strip of a diflerent material than that of the inner and outercoils and positioned inthe channels of one of them, and then removingthe filling strip after the coils are formed. 7

2. A method of forming an ornamental tubing, which consists in winding aplurality of channel-shaped strips of metal into helical coils one uponthe other with the in wardly-extending side flanges of each outercoilextending into the channels between outwardly extending side flangesof adjacent inner coils, and at the same time winding into helical forma separate strip of a material difierent than the material of eitherinner or outer 0011s and posltioned in the channels of the inner co1l'when wound, drawing -:the tube when wound through a die to 'intohelical coils one upon the other with the inwardly-extending sideflanges of each outer coil extending into the channels be tweenoutwardly-extendinge side flanges of adjacent inner coils, and at thesame time winding into helical form a separate strip of a materialdifferent than the material of either the inneror outer coils andpositioned in the channels of the inner coil when wound, drawing thetube when wound through a die to smooth the outer surface, pressing theouter surface of the outer coils for ornamentation and then removing thefilling strip.

4. A method of forming an ornamental tubing, which consists in winding aplurality of channel-shaped strips of metal into helical coils one uponthe other'with theinwardly-ext'ending side flanges of each outer coilextending into the channels between outwardly extending side flanges ofadjacent inner coils and at the same time'winding into helical form, aseparate strip of a material difi'erent'than the material of eitherinner or outercoils the strip being positioned in the 7 channels of theinner coil when wound, pressing the outer surface of the outer coils forornamentation and then removing the filling strip.

5. A method of forming an ornamental tubing, which consists in winding aplurality of channel-shaped strips of metal'i'nto helical coils one uponthe other with thehinwardly-extending side flanges of each outer coilextending into the channels between outwardly extending side flanges ofadjacent inner coils and at the same time winding into helical form afilling strip of a difierent material than that of the inner and :outercoils and positioned in the channels of one of them, and then dissolvingthe filling strip after the coils are formed.

outer surface of the outer coils for ornamen= 115 6.'A method offormingan ornamental I tation and then dissolvingthe filling strip tubin whichconsists in winding a plurality 0 channel-shaped strips of metal intohelical coils one upon the other with the inwardly-extending sideflanges of each outer coil extending into the channels between outwardlyextending side fianges of adjacent 10 inner coils, and at the same timewinding into helical form a separate strip of a material 'difierent'thanthe material of either inner or outer coils the strip being positionedin the cha-nnels of the inner coil when wound, drawing the-tube whenwound through a die to smooth the'outer surface and change the shape ofthe tube from cylindrical, and then removingthe filling strip. v I

- In testimony whereof I afiix my signature.

HERMANN KELLER.

